"""
Data models for sync operations.
"""
from dataclasses import dataclass, field
from datetime import datetime
from typing import Optional


@dataclass
class SyncOperation:
    """
    Model for tracking sync operations.
    
    Attributes:
        entity_type: Type of entity being synced ("merchant" | "catalogue" | "employee" | "warehouse")
        entity_id: Unique identifier of the entity
        operation: Type of operation ("create" | "update" | "activate" | "deactivate")
        timestamp: When the sync operation was created
        retry_count: Number of retry attempts made
        last_error: Last error message if sync failed
    """
    entity_type: str
    entity_id: str
    operation: str
    timestamp: datetime = field(default_factory=datetime.utcnow)
    retry_count: int = 0
    last_error: Optional[str] = None
    
    def __post_init__(self):
        """Validate entity_type and operation values"""
        valid_entity_types = {"merchant", "catalogue", "employee", "warehouse", "catalogues", "merchants", "warehouses", "employees", "uom"}
        if self.entity_type not in valid_entity_types:
            raise ValueError(f"entity_type must be one of {valid_entity_types}, got {self.entity_type}")
        
        valid_operations = {"create", "update", "activate", "deactivate"}
        if self.operation not in valid_operations:
            raise ValueError(f"operation must be one of {valid_operations}, got {self.operation}")